Concrete mixer



April 3, 1951 R. M. SELBY v 2,547,500 I CONCRETE MIXER Filed Nov. 9 3Sheets-Sheet 1 Robert M. Selby INVENTOR.

April 3, 1951 2,547,500

R. M. SELBY CONCRETE MIXER Filed Nov. 1 950 3 Sheets-Sheet 2 Robert M.Selby INVENTOR.

BY a awyfim April 3, 1951 R. M. SELBY CONCRETE MIXER iled Nov. 16, 19503 Sheets-Sheet 3 5 J Fig-4 32 54 I" H 0 Q: L

Fig.9

Robert M. Selby INVENTOR.

Patented Apr. 3, 1951 UNITED STATES PATENT r OFFICE CONCRETE MIXER toibr M- S l y, Nic llet, Minn- Application November 1c, 195.0, Serial No.195,947

- This invention relates to improvements in attachments for tractors.

An object of this invention is to provide a concrete mixer attachmentfor a standard tractor, said attachment being provided with a framewhich is specially designed to accommodate a c-pntainer whereby thecontainer is capable of rotating about a horizontal axis to empty thecontainer, the frame being so constructed that it is capable of beingraised and lowered by the standard tractor draw bar while the agitatoris being operated by means of an improved drive con ect n- Qther objectsand-Ieatu-resof importance will become app ren in following th d r p ionof the illustrated form of the invention.

- Figure 1 is a fragmentary sectional view of a standard tractor havingthe attachment thereon in one position;

Figure 2 is a view somewhat similar to that of Figure 1 but showing theattachment in a secnd po i Figure 3 is a sectional view similar to theviews of Figures 1 and 2 but showing the attachment in a furtheradjusted position;

Figure 4 is a'plan view of the structure of Figure 1;

Figure 5 is an enlarged plan view of the tightener used'in the deviceand showing in section the means of attaching it to a tractor;

Figure 6 is a fragmentary perspective view of a part of the drivemechanism and the tightener for it;

-Figure 7' is a perspective view of a part of the tightener mechanism;

Figure 8 is. a fragmentary perspective view showing the side swaypreventing device, and;

' Figure 9 is a sectional view taken on the line 9-45 of Figure 8 and inthe direction of the arrows.

The illustrated attachment is applied to .a

tractor 10 which is fragmentarily shownand which is of purely standardconstruction. Among the standard'equipment of the tractor is the rearaxle housing 12, the wheels l3, the difierential case I4, control springtogether with the rocker t, which is used .to transmit movement inopposition to the sprin l5, and a pivot p n ll moun n the ro ker l6. fomo e= ment- A drew bar I? is'm unted at. he rear of he trac or and thedraw bar omprises a pairof a ms !9 and hich are connected at th i innerends t the racto for swivel mo ement andwhieh arearranged to he raisedand lowered 3 Claims (Cl. 259-171) by means of the links 2| and 22.These links are connected to the lift :arms 23 and 24, this There is aframe 30 which is operatively con- 'nected to the arms l9 and 20.

The frame includes sides 3| and 32 which are connected to a back channelmember 34 by standard means,- as by welding. A vertical section issecured to the ends of the cha-nelmember 34 and includes a pair of sideswith an upper cross member 36.

In order to attach the frame to the arms I 9 and 21] two identicalassemblies are provided.

Each assembly (Figure 8) consists of a pair of plates 46 and 4| whichare spaced slightly from each other and which are fixed to the channel34.- The plates depend from the channel and support a pivot pin 52 whichpasses through the bearing 44 at the outer end of the bar 20, therebeing an identical assembly provided for the arm [9.

In order to prevent excessive side sway of the frame, the swaypreventing device disclosed in Figure 8 is used. This device consists ofa substantially rectangular open ended casing 46.

which is slidably disposed on the bar 20 andwhich has a rod 41 welded orotherwise rigidly.

fixed to it. This bar is also secured to the pivot pin 42.

bar 4'! junction with the case 46.

secured to the channel 34. Accordingly by this assembly the lateralthrust or side sway of the device is transmitted to one of the pivotassemblies for holding the frame connected to the draw bar.

There is a container 50 having an open top This container has anagitator shaft 52 passed through the side walls thereof and mounted inbearings 53 and 54 which are securedto the sides 3! and 32 of the frame30. this construction the container 50. is carried by he frame in such away that it is ca able of being rotated for the purpose of emptyingthe'j on iner.

A plurality of agitator blades are disposed in the container and arefixed to the agitator shaft,

A lateral thrust member 48 is welded or otherwise rigidly fixed to thebar 4'! near the:

The other end of the member 48 is riveted or otherwise rigidlyAccordingly by Each blade 69 is staggered with respect to the nextadjacent one. The blades are in pairs, one being at one end of a bladesupport arm El and the other being at the opposite end of the bladesupport arm. These arms are welded to the shaft 52 and are spaced fromeach other. They are not in longitudinal alignment but are rotated aslight amount with respect to the next adjacent one. By this arrangementgreater agitation takes place within the container 55.

A sprocket 62 is fixed to one outer end of the shaft 52 and has a chain63 entrained therearound. This chain also extends around a sprocket 64which is connected with a lay shaft 65 by means of a standard slipclutch 56. The clutch, sprockets 62 and 66 and chain 63 constitute ameans of transferring rotation of the lay shaft 65 to rotation of theagitators on the agitator shaft 52.

A The lay shaft 65 is disposed in standard bearings 61 and 68 which arecarried by the channel 34 of the frame 35. At the end of the shaft 65opposite from the sprocket 64 there is another sprocket it which has achain 12 extending therearound. This chain constitutes a flexibleelement for actuating the shaft 65 inasmuch as it is also engaged withthe teeth of the sprocket 21.

Means for holding the chain 12 tightly enmeshed with the teeth of thesprockets 21 and I0 is provided. Preferable means consists of an idlersprocket mounted on a spindle 16, this spindle being carried by a leverH. The inner end of the lever is pivoted to the pivot pin IT andaccordingly the lever I1 is capable of being raised or lowered dependingupon the necessities.

Means yieldingly opposing the operation of the lever 1! in one directionis provided and is preferably in the form of a standard spring which hasone end secured to the outer end of the lever 1'! and the opposite endis secured to a support 8|. The lower end of the support is mounted onthe pivot pin l1 and the support is held in a fixed position by means ofthe arm 83 which is bolted or otherwise rigidly fixed to a part of thetractor.

Attention is invited to Figures 1-3 wherein the action of the tighteningdevice is illustrated. When the lift bars l9 and 20 are lowered, as whenthe container is to be filled, the lever Ti swings downwardly, as it ispulled by the chain 12. ingly by the spring 80.

When it is desired to move the tractor from one place to another thecontainer is elevated by upward movement of the draw bar. At this timethe spring 80 pulls the lever 1'! upwardly to thereby retain the chain12 in the tight condition. The raised condition of the container 55being the emptying position (Figure 3); the action of the belt tighteneris not changed when transporting the concrete from one place to theother or when emptying the concrete.

There is a compression link 85 pivoted at one end to the rocker I6 andpivoted in a bearing (if: at the other end to the top part of the crossmember 36 of the frame construction. This compression link 85 serves itsconventional function.

In order to hold the container in the latched condition a rod 88 ismounted in brackets 89 on the top cross member 36 of the frame and hasan end portion bent tO C0] .'l Stitulie a handle. A spring QLsecured atone end to the handle 96 and at the other end to one of the sides of theThis downward movement is opposed yieldvertically extending part of theframe opposes the movement of the rod 88 and constantly retains thelatch keeper 92 in engagement with the reinforced upper edge of thecontainer 50.

When the handle is rotated against the yielding opposition of the spring9|, the latch keeper is lifted from engagement with the reinforced openupper edge of the container 53 and the container may be swung downwardlymanually by using the handle 94, which is welded or otherwise rigidlyfixed to one side of the container 5B.

In operation, the container 58 is loaded to the proper capacity.Thereafter the agitator shaft 52 is operated through the power take offby the described structure.

' After the concrete is mixed the draw bar may be lifted by the standardtractor elements and the container 50 emptied.

In transit, it makes no difference as to the roughness of the terrain,inasmuch as the drive mechanism between the agitator shaft 52 and thepower take off is flexible to the extent indicated previously. When thecontainer is emptied, raised or lowered the agitator need not beinvention, what is power take on", a draw bar and a pivot pin mounting arocker, a mixer comprising a frame pivotally connected to the draw bar,a container having an agitator shaft mounted in bearings on said frame,a lay shaft having a drive element at one end and means drivinglyconnecting the other end to said agitator shaft, a flexible drive memberengaged with said drive element and driven by the power take off, atightener operatively connected with said flexible drive member andpivoted to said pivot pin, a compression link connected to said rockerand said frame, and a brace secured to said frame and slidably connectedto the drawbar to impede side sway of said frame.

2. Incombination with a tractor which has a power take off, a draw barand a pivot pin mounting a rocker, a mixer comprisinga frame pivotallyconnected to the draw bar. a container having an agitator shaft mountedin bearings on said frame, a lay shaft having a drive element at one endand means drivingly connecting the other end to said agitator shaft, aflexible drivemember engaged with said drive element and driven by thepower take off, a tightener operatively connected with said flexibledrive mem-] ber and pivoted to said pivot pin, a compression linkconnected to said rocker and said frame;"

and yielding means opposing the pivotal movement of said tightener inone direction and retaining said flexible drive member tight. 3. Incombination with a tractor which has a power take off, a draw bar and apivot pin' mounting a rocker, a mixer comprising a frame pivotallyconnected to the draw bar, a container 8 of said tightener in onedirection and retainin said flexible drive member tight, and a latchconnected with said frame and arranged to hold said container in apredetermined position.

ROBERT M. SELBY.

REFERENCES CITED The following references are of record in the file ofthis patent:

Number Tull May 23, 1950

